01 -
Set oven to 425°F and line a tray with parchment.
02 -
Massage lemon zest into sugar, then whisk it with flour, salt, baking powder, and soda.
03 -
Mix chunks of cold butter into the flour mix by hand or with a pastry cutter until it looks like little crumbs.
04 -
Stir buttermilk and egg together, then gently mix this into the dry ingredients till just combined.
05 -
Shape dough into an 8-inch round, slice into 8 pieces, brush with buttermilk, and pop in freezer for 15 minutes.
06 -
Bake for about 20 minutes till golden. Once cooled, pour the glaze over the top.